Muni operators on Tuesday rejected a proposed contract that would have resulted in $15 million in savings for the transit agency over the next two years.

Details about the contract proposal with the Transport Workers Union Local 250-A were scant, but if approved, the new deal could have lessened the impact of the agency’s proposed service cuts and fare increases, according to San Francisco Municipal Transportation Agency Executive Director Nathaniel Ford.

A union spokesman could not provide details about how much the contract was defeated by Tuesday. The union represents 2,500 operators.

The operators were asked to make midcontract concessions as a way to plug the agency’s gaping budget hole.